/*
  easy method to stack multiple functions on the window.onload method
*/
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

/*
  xhtml valid popup
*/
function preparePopups() {
  if (!document.getElementsByTagName) return false;
  var lnks = document.getElementsByTagName("a");
  for (var i=0; i<lnks.length; i++) {
		if(lnks[i].className.indexOf("popup") != -1){
      lnks[i].onclick = function() {
        popUp(this.getAttribute("href"));
        return false;
      }
    }
  }
}
function popUp(winURL) {
  window.open(winURL);
}

addLoadEvent(preparePopups);